William's Shut Up, Hannibal! speech to Jorge of Burgos in the end. Even though William failed, at least he tells the killer exactly what he thinks of him, providing the emotional climax of the novel.
You are the Devil. Yes. They lied to you. The Devil is not the Prince of Matter; the Devil is the arrogance of the spirit, faith without smile, truth that is never seized by doubt. The Devil is grim because he knows where he is going, and in moving, he always returns whence he came. You are the Devil, and like the Devil, you live in darkness. If you wanted to convince me, you have failed. I hate you, Jorge, and if I could, I would lead you downstairs, across the grounds, naked, with feathers stuck in your asshole and your face painted like a juggler and a buffoon, so that the whole monastery would laugh at you and be afraid no longer. I would like to smear honey all over you and roll you in feathers and take you on a leash to fairs, to say to all: He was announcing the truth to you and telling you that the truth has the taste of death, and you believed not in his words but in his grimness. And now I say to you that in the infinite whirl of possible things, God allows you to imagine a world where the presumed interpreter of the truth is nothing more than a clumsy raven who repeats words learned long ago.